The secret to a frothy pineapple margarita is a full 30-second shake — it whips the Cointreau into a light foam on top. Canned pineapple juice, fresh lime, and a Tajin rim do the rest.
Slice the limes and squeeze out enough juice to measure 1 ounce. Reserve
Rim the glass with a wedge of lime and dip the edge into 1 tablespoon Tajin to rim the glass.
Fill a cocktail shaker with ice and add 3 ounces pineapple juice, 2 ounces tequila blanco or reposado, 1 ounce lime juice, ¾ ounce Cointreau. Secure the lid and shake for 30 seconds until the margarita is frothy and the shaker is icy cold.
Add additional ice to the rimmed cocktail glass and pour the pineapple margarita over the ice. Garnish with a slice or wedge of pineapple sprinkled with a little Tajin. Enjoy.
Notes
For a more dramatic presentation, we grilled our pineapple slices at 400° for 3-4 minutes per side and sprinkled with Tajin. The fresh pineapple leaves also make a pretty garnish (though they're spiky, so watch out!)